Trauma

Retrobulbar Hematoma

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Retrobulbar Hematoma, Retrobulbar Hemorrhage, Acute Orbital Compartment Syndrome, Orbital Compartment Syndrome

  • See Also
  1. Lateral Canthotomy
  2. Eye Trauma
  • Pathophysiology
  1. Trauma to eye results in infraorbital artery distribution Hemorrhage
  2. Orbit is a closed space
    1. Surrounded by bone in all planes except anteriorly
    2. Anterior margin is blocked by the medial and lateral canthal tendons which hold the globe in the orbit
  3. Hemorrhage results in increased orbital pressures
  4. Compartment Syndrome results if these pressures are not decompressed
    1. Compression of artery and Optic Nerve
    2. Retinal ischemia results when Intraocular Pressure increases above central Retinal artery pressure
      1. Irreversible injury may start within 60 minutes of ischemia onset
  • Signs
  1. Eye Pain
  2. Decreased Visual Acuity
  3. Proptosis
  4. Subconjunctival Hemorrhage
  5. Decreased Extraocular Movement
  6. Increased introcular pressure
  7. Afferent pupil defect
    1. Associated with Optic Nerve injury
  • Imaging
  1. CT Head
  2. Bedside Orbital Ultrasound
    1. Exercise caution to prevent significant pressure on globe
  • Management
  • General
  1. Emergent opthalmology Consultation for surgical decompression
  2. Emergent Lateral Canthotomy (see below) if indicated
  1. Retrobulbar Hematoma and
  2. Primary indications
    1. Proptosis
    2. Intraocular Pressure >40 mmHg
    3. Decreased Visual Acuity
  3. Secondary indications
    1. Afferent Pupillary Defect (see Orbital Ultrasound)
    2. Eye Pain
    3. Funduscopic changes
      1. Cherry red Macula
      2. Pallor of the nerve head
  • References
  1. Dreis (2020) Crit Dec Emerg Med 34(7):3-21
  2. Peak in O'Connor (2012) Medscape: EMedicine
    1. http://emedicine.medscape.com/article/799528-overview#showall
  3. Wu in Majoewsky (2012) EM:Rap 12(11):11-12